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김관수 한국균학회 1979 韓國菌學會誌 Vol.7 No.2
This paper is to investigate the standing crops and microfungal flora in soil in Phyllostachys reticulate forests in both the Yesan area (A) and the Kwangsan area (B). The stand density of the bamboo revealed 17,250 shoots per ha in area A, and in area B 14,780 shoots which were 16.1 less in number than area A. In respect to the environmental factors between the two areas, the mean temperature during the growth period was 1.5∼2℃ higher in area B than in area A, soil temperature also was 1∼2℃ higher in area B, and the total quantities of nitrogen, phosphoric acid and organic compounds contained in the soil of area B were also slightly higher than those of area A. In area B the quantities of dried leaf matter, humus, and vegetation in the bamboo forest were also larger than in area A. In addition, five more species of microfungi which play a role in the decomposition of the various organic materials in the bamboo forests were identified in area B: Mortierella elongata. Mucor circinelloides, Aspergillus japonicus, Penicillium waksrnani and Trichoderma lignorum. The atmospheric temperature in the inner portions of the bamboo forests was lower than the outside temperature, but the humidity was higher. The rates of relative illuminance were measured in area A at 4.19%, and in area B at 2.7%. These values revealed that the photosynthetic activity in the lower part of the bamboo was lost but it was considered that lower illuminance increased the microfungal activities in the vicinity of the surface soil. Since the productive structure of the bamboo showed that the maximum amount of photosynthesis was located in the upper portion of the bamboo in area B, it was considered to be an effective structure in maintaining the high productivity of the bamboo. The allometric relation between D²H and dry weight of stems(Ws), branches(Wb) and leaves(Wl) of the bamboo in area A were appoximated by log Ws=0.5262 log D²H+1.9516; log Wb=0.6288 log D²H+1.5723; log Wl=0.5181 log D²H+1.8732, and those of the bamboo in area B were approximated by lug Ws=0.5133 log D²H+1.5610; log Wb=0.1630 log D²H+2.3175; log Wl=0.4509 log D²H+2.0041. From the above, the standing crops in area A were measured thus : Ws was 1.128.83㎏; Wb 689.05㎏; Wl, 926.69㎏ and Wt, 2,744.57㎏ per 10a. In area B, Ws was 1,206.66㎏; Wb, 679.92㎏ Wl, 1.112.51㎏ and Wt, 2.999㎏ per 10a. Significant differences from the result of t-test were for D²H Ws, Wl and Wt between areas A and B. But no significant difference was found for Wb. In order to record as completely as possible the microfungal flora of the areas, every possible means was tried, and 158 strains of fungi were isolated, and of these, the microfungi of 55 species were identified. The dominant species were Trichoderma viridc, Penicillium jantnincllurn, P. commune. Aspergillus oryzae, A. niger, A. gigantus, A. fumigatus, Mortierella ramaniana, var. angulispora, Mucor hiemalis and Zygorhyncicus moelleri. According to the above results, it was revealed that optimum soil, the increases of soil materials, more species of soil microfungi, and the atmospheric temperature during the growth period have made the bamboo flourish and bring more species and larger quantities of vegetation in the bamboo forests. The correlation between the standing crops and environmental factors in the bamboo forest is considered to be a complicated relationship of all the factors, but the stand density is thought to be the most important factor involved.
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김관수,황영현,황인찬,조원주 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.3
We investigated the effects of Ar and O2 treatment and of Ar/O2 mixedplasma treatment onthe electrical characteristics of solution-processed amorphous indium-gallium-zinc-oxide (a-IGZO)thin-film transistors (TFTs). The electrical performance and the instability of a-IGZO TFTs weresignificantly improved by the plasma treatments. The plasma treatments reduced the carbon-basedresidual contamination that acted as possible trap sites. In particular, the O2-plasma treatmentproduced a significant improvement in the reliability of a-IGZO TFTs when compared with theAr-plasma-treated device, owing to the elimination of residual carbon in the active channel of thesolution-processed a-IGZO. However, the optimized improvement of the solution-processed a-IGZOTFT under a gate bias stress was obtained for the device treated with an Ar/O2 mixed-gas plasma. The plasma treatment in the Ar/O2-mixed ambience remarkably enhanced not only the reliabilitybut also the electrical performance of the a-IGZO TFT; the on/off-current ratio, the field-effectmobility, and the subthreshold slope were 6.78 × 107, 1.24 cm2/V·s, and 513 mV/dec, respectively.
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Ultrathin-body SOI MOSFETs에서 면방향에 따른 정공의 이동도 증가
김관수,조원주,Kim, Kwan-Su,Cho, Won-Ju 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.11
We investigated the characteristics of UTB-SOI pMOSFETs with SOI thickness($T_{SOI}$) ranging from 10 nm to 1 nm and evaluated the dependence of electrical characteristics on the silicon surface orientation. As a result, it is found that the subthreshold characteristics of (100)-surface UTB-SOI pMOSFETs were superior to (110)-surface. However, the hole mobility of (110)-surface were larger than that of (100)-surface. Especially, the enhancement of effective hole mobility at the effective field of 0.1 MV/cm was observed from 3-nm to 5-nm SOI thickness range.
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김관수,김호철 한국작물학회 2003 Korean journal of crop science Vol.48 No.S
To clarify the botanical origins of oriental medicines which have been argued or confused for plant origins, species of original plants were investigated through the textural research for oriental medicines and the comparison of Chinese, Korean, Japanese and North Korean Pharmacopoeia. Twenty oriental medicines were studied; Angelicae Gigantis Radix, Rhei Rhizoma, Atractylodis Rhizoma Alba, Aconiti Lateralis Radix Preparata, Acanthopanacis Cortex, Osterici Radix, Cnidii Rhizoma, Saposhnikovae Radix, Magnoliae Cortex, Paeoniae Radix, Liriopis Tuber, Zanthoxyli Fructus, Achyranthis Radix, Sinomeni Caulis et Rhizoma, Polygonati Rhizoma, Cinnamomi Cortex, Visci Herba et Loranthi Ramulus, Fritillariae Thunbergii Bulbus, Pogostemonis Herba, and Curcumae Longae Radix.
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LTCC 기판재료 응용을 위한 다양한 충전제 함유 CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> 유리복합체 연구
김관수,장호순,신현호,김인태,김신,한용현,윤상옥,Kim, Kwan-Soo,Jang, Ho-Soon,Shin, Hyun-Ho,Kim, In-Tae,Kim, Shin,Han, Yong-Hyun,Yoon, Sang-Ok 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.3
Influences of ceramic filler types and dose on the sintering, phase evolution, and dielectric properties of ceramic/CaO-$Al_2O_3-SiO_2$ glass composites were investigated. All of the specimens were sintered at $900^{\circ}C$ for 2 h, which conditions are required by the lowtemperature co-firing ceramic (LTCC) technology. Ceramic fillers of $Al_2O_3,\;SiO_2$, kaolin, and wollastonite were used. The addition of $Al_2O_3$ filler yielded the crystalline phases of alumina and wollastonite, and the densification over 95% of the relative density was achieved up to 50 wt% addition of the filler. For the cases of the fillers of $SiO_2$, kaolin, and wollastonite, crystalline phases of quartz, mullite, and wollastonite formed, while the densification decreased monotonically with the filler addition. In overall, all the investigated fillers with 10 wt% addition resulted in a reasonable sintering (over 95 %) and low dielectric constants (less than 6), demonstrating the feasibility of the investigated composites for application to a LTCC substrate material with a low dielectric constant.
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Time-Domain Dynamic Simulation of a Wind Turbine Including Yaw Motion for Power Prediction
김관수,백인수,임창희,Yongoon Oh,권일한,유능수 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
A new wind turbine simulation tool for a time-domain dynamic simulation was developed in this study. The tool consists of modelsof aerodynamics, drive train, generator, actuators, and controllers for pitch and yaw controls. For the wind turbine model, the NREL5MW reference wind turbine was used. Using measured data, the developed tool was applied to predict annual energy productionfrom the wind turbine at four different sites in a complex terrain of Korea. The results were compared with those predicted by acommercial frequency-domain program widely used to predict the annual energy production from a wind turbine. Without a yawcontrol, the predictions from the proposed tool were close to those from the commercial wind farm design program. Also, fromsimulations with and without yaw controls, the differences in power predictions were quantified. The results of this study suggest thatthe power production from a wind turbine can be predicted by the proposed time-domain wind turbine simulation tool with a properyaw algorithm which is not available in commercial frequency-domain programs. Further research is needed to experimentallyvalidate the simulation results with yaw algorithm.
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